The release of version 21 of Oxygen XML Editor adds numerous new features, updates, and improvements to the already robust, industry-leading XML editing application. The primary focus for this major release was to evaluate user requests for improvements and additions, implement as many of them as possible, while preserving the reliability, stability, and performance requirements that the XML community has come to expect from the Oxygen suite of products.

This major release includes numerous productivity improvements for DITA authors, the CSS-based PDF Publishing support and the Oxygen PDF Chemistry engine were enhanced with many new possibilities for improving PDF output, a major effort was put into making the JSON editing support as robust as the other built-in document types, various features were added for XSLT and XQuery developers, as well as updates to add-ons, new API entry points, component updates, performance improvements, and much more.

Collaboration for your XML documentation review process is now readily available since the Oxygen Content Fusion connector add-on is already installed in Oxygen XML Editor.

You may encounter difficulties using some third-party database drivers/plugins with native libraries that do not support the 64-bit architecture. If you do, you should install and use the Windows 32-bit kit of Oxygen.

The 64-bit edition of Oxygen has a slightly larger memory footprint than the 32-bit edition due to the nature of the 64-bit architecture and JVM.

If Oxygen fails to start on macOS Sierra (10.12), High Sierra (10.13) or Mojave (10.14), you should clear the quarantine flag from its folder by running this command in a Terminal (you will be prompted to enter your password due to sudo):sudo xattr -dr com.apple.quarantine "/Applications/Oxygen XML Editor"

On macOS Sierra (10.12) and later Oxygen requires the option System Preferences > Security & Privacy, Allow apps downloaded from to be set to App Store and identified developers during the installation phase.